Fuel pressure regulator

Abstract

The utility model relates to a fuel pressure regulator, fuel pressure regulator is used for fuel pump assembly, and the fuel pressure regulator includes: shell, outside has oil inlet space, and the shell includes oil outlet pipe and a plurality of lead through hole. Diaphragm component divides the shell inside space into independent pressure chamber and fuel chamber, and the lead through hole is used for connecting the oil inlet space and fuel chamber. The diaphragm component includes diaphragm, top block mechanism, sealed top ball and pressure spring, and the pressure spring is located in the pressure chamber, and the diaphragm edge sealed connection is in the shell, and the sealed top ball is round spherical. The one end of oil outlet pipe is towards the fuel chamber, and the opening of oil outlet pipe is provided with sealed chamfer, and the sealed top ball is sealed and is in contact with the taper surface of sealed chamfer under the elastic pre-tightening force of pressure spring. Sealed top ball is linearly sealed with the taper surface of sealed chamfer under the pre-tightening force of pressure spring, and the sealing effect is good.

Description

Technical Field

[0001] This utility model relates to the field of combustion engine technology, and in particular to a fuel pressure regulator. Background Technology

[0002] Existing fuel pressure regulators are used in fuel pump assemblies, where the fuel pump delivers fuel to the fuel pressure regulator. The fuel pressure output by the pressure regulator is stable. For example, the public document CN205400954U provides a fuel pressure regulator including a regulator body, an inlet, an outlet, a spring chamber, a spring, a combustion chamber, a diaphragm, a vent pipe, a return valve, a filter layer, and a pressure gauge. The regulator body has a spring chamber and a combustion chamber inside, which are connected by a diaphragm. A spring is installed in the spring chamber, and one side of the spring chamber is connected to the vent pipe. A filter layer is installed in the vent pipe, and the bottom of the spring chamber is connected to the diaphragm. A return valve is installed on the diaphragm, and the bottom of the diaphragm is connected to the combustion chamber. The combustion chamber has an inlet on one side and an outlet at the bottom. Pressure gauges are installed on the inner walls of the inlet and outlet.

[0003] The oil inlet and outlet are controlled by a return valve. However, the existing return valve is a flat seal, which is prone to leakage. Furthermore, the high precision required for machining the flat surface of the return valve results in a low yield rate. Therefore, improvements are needed. Utility Model Content

[0004] To overcome the problems existing in related technologies, this utility model provides a fuel pressure regulator to solve the technical problems of easy leakage and low yield rate of the fuel pressure regulator switch part.

[0005] According to a first aspect of the present invention, a fuel pressure regulator is provided for a fuel pump assembly, the fuel pressure regulator comprising:

[0006] The housing has an external oil inlet space, and the housing includes an oil outlet pipe and multiple through holes;

[0007] A diaphragm assembly divides the internal space of the housing into independent pressure chambers and fuel chambers, and the through hole is used to connect the fuel inlet space and the fuel chamber;

[0008] The diaphragm assembly includes a diaphragm, a top block mechanism installed at the center of the diaphragm, a sealing top bead installed on the top block mechanism, and a pressure spring. The pressure spring is located in the pressure chamber, the edge of the diaphragm is sealed to the outer shell, and the sealing top bead is spherical.

[0009] One end of the oil outlet pipe protrudes into the fuel chamber, and the opening of the oil outlet pipe is provided with a sealing chamfer. The sealing top bead seals against the conical surface of the sealing chamfer under the elastic preload of the pressure spring.

[0010] In one embodiment, the top block mechanism includes a mounting base, a pressure holding spring, and a baffle. The mounting base is provided with a mounting hole, the baffle is installed in the opening of the mounting hole, and the baffle has a movable hole at its center.

[0011] The pressure-holding spring elastically pushes against the sealing top bead, which is located inside the mounting hole and partially protrudes from the movable hole.

[0012] In one embodiment, the mounting hole is a tapered hole, and the pressure-holding spring is located at the bottom of the mounting hole.

[0013] In one embodiment, the mounting base includes an inwardly folded edge that presses against the edge of the baffle.

[0014] In one embodiment, the top block mechanism includes a sleeve, a portion of the mounting seat passes through the diaphragm and is fitted and fixed with the sleeve, and the mounting seat and the sleeve are pressed together to fix both sides of the diaphragm.

[0015] In one embodiment, the sleeve is partially bent to form a positioning groove, and the pressure spring is confined within the positioning groove.

[0016] In one embodiment, the outer casing includes a first housing and a second housing, which are closed and pressed together to press against the outer side of the diaphragm. The through-hole penetrates the first housing, and a plurality of the through-holes are arranged around the oil outlet pipe.

[0017] In one embodiment, the first housing is provided with an outwardly protruding tube, and the oil outlet tube is interference-fitted into the outwardly protruding tube.

[0018] In one embodiment, the first flange edge of the first housing is press-fitted over the second flange edge of the second housing.

[0019] In one embodiment, the fuel pressure regulator further includes a first sealing group and a second sealing group. The first sealing group is fitted onto the protruding tube of the first housing, and the second sealing group is fitted onto the first housing and pressed against the edge of the first flange. The through hole is located between the first sealing group and the second sealing group.

[0020] The technical solution provided by the embodiments of this utility model can include the following beneficial effects: the sealing top ball, under the preload of the pressure spring and the linear seal of the conical surface of the sealing chamfer, not only has a good sealing effect, but is also easy to process and not prone to leakage. The sealing chamfer can automatically guide the sealing top ball to center and seal, resulting in good sealing repeatability. Multiple through holes are arranged around the fuel outlet pipe, allowing the fuel pump assembly to deliver fuel to the fuel chamber from different angles without the need for external piping, greatly improving the efficiency of the fuel flow channel and the balance of the diaphragm force. Attached Figure Description

[0021] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the present invention and, together with the description, serve to explain the principles of the present invention.

[0022] Figure 1 This is a schematic diagram of the structure of a fuel pressure regulator according to one embodiment.

[0023] Figure 2 This is a schematic diagram of the exploded structure of a fuel pressure regulator according to one embodiment.

[0024] Figure 3 This is a bottom view schematic diagram of a fuel pressure regulator according to one embodiment.

[0025] Figure 4 This is a cross-sectional structural schematic diagram of a fuel pressure regulator according to one embodiment.

[0026] Figure 5 This is a cross-sectional structural schematic diagram of a diaphragm assembly according to one embodiment.

[0027] Figure 6 This is a schematic diagram of the exploded structure of a diaphragm assembly according to one embodiment.

[0028] In the figure, the outer shell is 10; the through hole is 11; the oil outlet pipe is 12; the sealing chamfer is 121; the second shell is 13; the first shell is 14; the pressure chamber is 15; the fuel chamber is 16; the outward protruding pipe is 17; the diaphragm assembly is 20; the diaphragm is 21; the top block mechanism is 22; the mounting base is 221; the protruding column is 2211; the mounting part is 2212; the inner folded edge is 2213; the mounting hole is 2214; the baffle is 222; the movable hole is 2221; the sleeve is 223; the pipe body is 2231; the flange is 2232; the pressure holding spring is 224; the pressure spring is 23; the sealing top ball is 24; the first sealing group is 30; the second sealing group is 40; and the oil inlet space is 50. Detailed Implementation

[0029] In the accompanying drawings of this utility model, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," "right," "inner," and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this utility model. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0030] like Figures 1 to 3 As shown, this utility model provides a fuel pressure regulator for a fuel pump assembly. The fuel pressure regulator includes a housing 10 and a diaphragm assembly 20. The housing 10 has a thin-walled shell structure. The diaphragm assembly 20 is transversely disposed inside the housing 10, and the diaphragm assembly 20 divides the internal space of the housing 10 into independent pressure chambers 15 and fuel chambers 16.

[0031] The fuel pressure regulator is mounted on the fuel pump assembly, wherein the outer surface of the housing 10 has a fuel inlet space 50, which is part of the fuel pump assembly. The housing 10 includes a fuel outlet pipe 12 and a plurality of through holes 11; the fuel outlet pipe 12 is used to output fuel with stable pressure, and the through holes 11 are used to connect the fuel inlet space 50 and the fuel chamber 16.

[0032] Multiple through holes 11 are provided, preferably two, three, four, five, etc. Multiple through holes 11 are arranged around the oil outlet pipe 12 so that fuel enters the fuel chamber 16 synchronously from different directions from the oil inlet space 50, thereby causing the diaphragm assembly 20 to deform synchronously. This not only results in a large fuel flow area, but also ensures that the diaphragm assembly 20 is deformed evenly under stress in all directions.

[0033] The diaphragm assembly 20 includes a diaphragm 21, a top block mechanism 22 installed at the center of the diaphragm 21, a sealing top bead 24 installed on the top block mechanism 22, and a pressure spring 23. The pressure spring 23 is located in the pressure chamber 15 and elastically pushes against the top block mechanism 22 so that the top block mechanism 22 is subjected to an elastic pre-pressure in the direction of the fuel outlet pipe 12. This elastic pre-pressure corresponds to the pressure of the fuel pressure regulator.

[0034] The edge of the diaphragm 21 is sealed to the outer shell 10 so that the diaphragm 21 moves centrally under the drive of the top block mechanism 22, thereby dividing the internal space of the outer shell 10 while maintaining both sealing and mobility.

[0035] Preferably, the sealing top bead 24 is spherical, so that the sealing top bead 24 can be abutted and sealed from any angle, making assembly convenient.

[0036] One end of the oil outlet pipe 12 protrudes into the fuel chamber 16. The opening of the oil outlet pipe 12 is equipped with a sealing chamfer 121. The sealing top ball 24, under the elastic preload of the pressure spring 23, seals against the conical surface of the sealing chamfer 121. The sealing top ball 24, under the preload of the pressure spring 23, forms a linear seal with the conical surface of the sealing chamfer 121. The sealing top ball 24 can seal and fit at any angle, resulting in not only good sealing performance but also convenient processing and low leakage. The sealing chamfer 121 automatically guides the sealing top ball 24 to center and seal, ensuring good sealing repeatability.

[0037] like Figures 2 to 6 As shown, the top block mechanism 22 mounts and limits the position of the sealing top ball 24 so that the sealing top ball 24 moves with the top block mechanism 22. The top block mechanism 22 includes a mounting base 221, a pressure holding spring 224, and a baffle 222.

[0038] Mounting base 221 is provided with mounting hole 2214, which is a groove structure that can accommodate part of the sealing top bead 24. Preferably, the depth of the mounting hole 2214 for accommodating the sealing top bead 24 is greater than the radius of the mounting hole 2214.

[0039] A baffle 222 is installed in the opening of the mounting hole 2214, and a movable hole 2221 is provided in the center of the baffle 222. A pressure-holding spring 224 elastically pushes against the sealing ball 24, and the sealing ball 24 partially protrudes through the movable hole 2221. The movable hole 2221 is a through hole structure, and the diameter of the movable hole 2221 is slightly smaller than the diameter of the sealing ball 24. The baffle 222 limits the maximum movable position of the sealing ball 24, wherein the sealing ball 24 can overcome the pressure of the pressure-holding spring 224 and compress into the mounting hole 2214.

[0040] As the pressure inside the fuel chamber 16 increases, the top block mechanism 22 compresses against the pressure spring 23. Simultaneously, the pressure-holding spring 224 pushes the sealing top ball 24 outwards to maintain the seal between the sealing top ball 24 and the fuel outlet pipe 12. As the top block mechanism 22 continues to move under pressure, the sealing top ball 24 abuts against the baffle 222 and gradually disengages from the fuel outlet pipe 12, allowing fuel to enter the fuel outlet pipe 12 and achieving a stable fuel output.

[0041] In one embodiment, the mounting hole 2214 is a tapered hole, and the pressure-holding spring 224 is located at the bottom of the mounting hole 2214. Because the mounting hole 2214 has a tapered hole structure, the sealing top bead 24 can automatically center itself after compression. The pressure-holding spring 224, located at the bottom of the tapered hole, can centrally push the sealing top bead 24.

[0042] Preferably, the mounting base 221 includes an inwardly folded edge 2213, which presses against the edge of the baffle 222. A thin-walled convex tube protrudes from the periphery of the mounting hole 2214 in the mounting base 221, and the baffle 222 is installed at the stepped surface of the mounting base 221 and located inside the thin-walled convex tube. Riveting the thin-walled convex tube to fix it forms the inwardly folded edge 2213 that fixes the baffle 222, achieving a riveted connection between the mounting base 221 and the baffle 222, improving the ease of connection.

[0043] like Figures 4 to 6 As shown, in one embodiment, the top block mechanism 22 includes a sleeve 223, which is a thin-walled tubular structure. A portion of the mounting base 221 passes through the diaphragm 21 and is fitted and fixed with the sleeve 223. The mounting base 221 and the sleeve 223 press and fix both sides of the diaphragm 21. The mounting base 221 is approximately T-shaped and includes a mounting portion 2212 and a protruding post portion 2211 protruding from the mounting portion 2212. The protruding post portion 2211 passes through the diaphragm 21 and is inserted and fitted with the sleeve 223. The flange portions of the mounting portion 2212 and the sleeve 223 together press and fix the diaphragm 21, which can both seal and facilitate assembly.

[0044] Furthermore, the sleeve fitting 223 is partially bent to form a positioning groove, and the pressure spring 23 is confined within the positioning groove. The flange portion of the sleeve fitting 223 is bent, and the cross-section on one side forms a J-shaped structure. The pressure spring 23 is sleeved on the sleeve fitting 223, and one end of the pressure spring 23 is confined within the positioning groove to prevent displacement of the pressure spring 23 and to ensure controllable range of motion. The sleeve fitting 223 includes a pipe body portion 2231 and a flange flange 2232 that protrudes radially from one end of the pipe body portion 2231. The pressure spring 23 is sleeved on the pipe body portion 2231, and the protruding post portion 2211 and the pipe body portion 2231 are interference-fitted to prevent oil leakage at the joint.

[0045] In one embodiment, the outer shell 10 includes a first shell 14 and a second shell 13. The first shell 14 and the second shell 13 are closed and pressed together to seal the outer side of the diaphragm 21, and the through hole 11 penetrates through the first shell 14. The first shell 14 and the second shell 13 are separately arranged for easy production and assembly. After the various components of the diaphragm assembly 20 are assembled, they are then assembled as a whole into the second shell 13. Both the first shell 14 and the second shell 13 are provided with flange-shaped flange structures. The first shell 14 and the second shell 13 are closed and pressed together to seal the diaphragm 21, which is made of rubber; or, the diaphragm 21 is made of a combination of rubber and non-woven fabric, which has an elastic effect.

[0046] like Figures 1 to 4As shown, the first housing 14 is provided with a first flange edge, and the second housing 13 is provided with a second flange edge. The first flange edge and the second flange edge are fitted together. The first flange edge of the first housing 14 is pressed and riveted to cover the second flange edge of the second housing 13 to form a press-fit connection. This can not only tighten the edge of the diaphragm 21, but also improve the ease of assembly and connection of the first housing 14 and the second housing 13, and avoid oil leakage at the joint.

[0047] The oil outlet pipe 12 is installed on the first housing 14, and the two are connected by an interference fit to avoid oil leakage at the joint. The first housing 14 is provided with an outwardly protruding pipe 17, and the oil outlet pipe 12 is interference-fitted into the outwardly protruding pipe 17. The outwardly protruding pipe 17 has a tubular protrusion structure, and the oil outlet pipe 12 is a tubular shaft body, which is inserted into the interference-fitted outwardly protruding pipe 17.

[0048] The fuel pressure regulator is installed on the fuel pump assembly, and the fuel pressure regulator and the fuel pump assembly are partially sealed at their contact surfaces to ensure that the range of the fuel inlet space 50 is controllable and the joint is sealed. The fuel pressure regulator also includes a first sealing group 30 and a second sealing group 40, both of which are provided with sealing oil rings and sealing rings.

[0049] The first sealing assembly 30 is fitted onto the protruding tube 17 of the first housing 14, and the second sealing assembly 40 is fitted onto the first housing 14 and pressed against the first flange edge. The through hole 11 is located between the first sealing assembly 30 and the second sealing assembly 40. The first housing 14 has a stepped structure on the outside, and the first sealing assembly 30 and the second sealing assembly 40 are located between two stepped surfaces to seal the corresponding outer space of the first housing 14. The space range of the oil inlet space 50 is controllable.

[0050] The through hole 11 is located on the stepped surface where the first sealing group 30 is located and is arranged around the first sealing group 30 to conduct the inner and outer spaces of the first housing 14, so as to realize the circumferential oil intake of the first housing 14.

[0051] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. This application is intended to cover any variations, uses, or adaptations of the present invention that follow the general principles of this application and include common knowledge or customary technical means in the art that are not disclosed in this invention.

Claims

1. A fuel pressure regulator for a fuel pump assembly, characterized in that, The fuel pressure regulator includes: The housing has an external oil inlet space, and the housing includes an oil outlet pipe and multiple through holes; A diaphragm assembly divides the internal space of the housing into independent pressure chambers and fuel chambers, and the through hole is used to connect the fuel inlet space and the fuel chamber; The diaphragm assembly includes a diaphragm, a top block mechanism installed at the center of the diaphragm, a sealing top bead installed on the top block mechanism, and a pressure spring. The pressure spring is located in the pressure chamber, the edge of the diaphragm is sealed to the outer shell, and the sealing top bead is spherical. One end of the oil outlet pipe protrudes into the fuel chamber, and the opening of the oil outlet pipe is provided with a sealing chamfer. The sealing top bead seals against the conical surface of the sealing chamfer under the elastic preload of the pressure spring.

2. The fuel pressure regulator according to claim 1, characterized in that, The top block mechanism includes a mounting base, a pressure holding spring, and a baffle. The mounting base is provided with a mounting hole, the baffle is installed in the opening of the mounting hole, and the baffle has a movable hole in the center. The pressure-holding spring elastically pushes against the sealing top bead, which is located inside the mounting hole and partially protrudes from the movable hole.

3. The fuel pressure regulator according to claim 2, characterized in that, The mounting hole is a tapered hole, and the pressure-holding spring is located at the bottom of the mounting hole.

4. The fuel pressure regulator according to claim 2, characterized in that, The mounting base includes an inwardly folded edge, which presses against the edge of the baffle.

5. The fuel pressure regulator according to claim 2, characterized in that, The top block mechanism includes a sleeve, a portion of the mounting seat passes through the diaphragm and is fitted and fixed with the sleeve, and the mounting seat and the sleeve are pressed together to fix both sides of the diaphragm.

6. The fuel pressure regulator according to claim 5, characterized in that, The sleeve is partially bent to form a positioning groove, and the pressure spring is confined within the positioning groove.

7. The fuel pressure regulator according to claim 1, characterized in that, The outer casing includes a first housing and a second housing. The first housing and the second housing are closed and pressed together to press against the outer side of the diaphragm. The through hole penetrates through the first housing, and a plurality of the through holes are arranged around the oil outlet pipe.

8. The fuel pressure regulator according to claim 7, characterized in that, The first housing is provided with an outwardly protruding tube, and the oil outlet tube is interference-fitted into the outwardly protruding tube.

9. The fuel pressure regulator according to claim 8, characterized in that, The first flange edge of the first housing is press-fitted to cover the second flange edge of the second housing.

10. The fuel pressure regulator according to claim 9, characterized in that, The fuel pressure regulator further includes a first sealing group and a second sealing group. The first sealing group is fitted onto the protruding tube of the first housing, and the second sealing group is fitted onto the first housing and pressed against the edge of the first flange. The through hole is located between the first sealing group and the second sealing group.

Images